Actually a cargo/pannier rack can be addded to any of them. The first one, a long wheel base (LWB), while riding like a Cadillac, doesn't turn corners as well and normally don't pull hills as well as their shorter cousins. They're primarily designed for touring.
The shorter ones, like the 3rd and last pics are better for commuting and general around town riding which will be my main use for it.
Either way they are far more comfortable than a standard diamond frame (DF) bike. They are often referred to as a "lawn chair on wheels".
Oh and just a little trivia. All of the bicycle speed records have been set with recumbents.